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Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 4.

(ft) without a metric equivalent. Navigational distances are stated in nautical miles, vertical speed in feet per minute, and horizontal speed in knots (being nautical miles per hour) without a metric equivalent. Verbal probability expressions For clarity, the Commission
Open official document at PDF page 4TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 8.

happened............................................................................................................................................ 29 Why was the aeroplane in Vertical Speed mode? ........................................................................... 30 Why was the error not detected during the descent? ..................................
Open official document at PDF page 8TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 14.

the aeroplane reached the transition level. 12 At this point the captain engaged the Vertical Speed (V/S) function of the autopilot flight director system. 13 The subscales on all three altimeters were then changed from 1013 hectopascals (hPa) to 1021
Open official document at PDF page 14TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 40.

for approaches in uncontrolled airspace (see Safety issue 2). Why was the aeroplane in Vertical Speed mode? 3.12. During the captain's interview, they stated they were unaware that the aeroplane had been in V/S mode until very late in the
Open official document at PDF page 40TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 46.

because changes in the correction are indistinguishable from changes in altitude and vertical speed. If the FMS is provided with both baro-corrected and pressure altitude, the existing FMS software is designed to automatically detect changes to the difference between th
Open official document at PDF page 46TAIC final report: ZK-NEM

Air New Zealand 8199: descent below safe altitude

Printed page label not indexed. PDF page 57.

issue within Air New Zealand's SMS Safety issue 5: Errors associated with the use of Vertical Speed mode were a known hazard for the Q300 operation, and there was knowledge that these errors were not always captured by 83 The
Open official document at PDF page 57TAIC final report: ZK-NEM